Combined screw and push electric plug



Jime 9, 193.1. I FF 1,809,478

COMBINED SCREW 'AND PUSH ELECTRIC PLUG Filed March 5, 1930 2 Sheets-Sheet l I n uentor c747 v7 'ef/awf A ttorney" June 9, 1931.. A. GEFFERT I 1,809,478

COMBINED SCREW AND PUSH ELECTRIC PLUG Fi'led March 5, 1930 '2 Sheets-Sheet 2 Inventor Jhr a7 fez 542M A itorney PatentediJun e 9,- 1 931 oFFIcn Jomr A. enrrnn'r, or, -WES1' nnlnenwarnn, rmmsrnvma' comzerm'zn scnnw m Application filed March 5',

This invention relates to combined screw and push-electric plugs and an object of the invention is to provide in one and the same plug, a connection'that isadapted to screw in- 5 electric sockets, and at the'same time to provide prongs that may be pushed into push plugs, thereby saving a great amount of time,. and energy, about the home.

-Further objects of the invention. are to provide a plug of. the character mentioned,- that is strong, compact and durable, thoroughlyireliable' for its intended purpose, very ing the screw efiicient in its operation, and comparatively inexpensive .to manufacture and install on electric appliances.

. With the foregoing and other objects in view the inventioncons'ists of a novelconstruction, combination and arrangement of parts, as will be hereinafter more specifically I described and illustrated in the drawings, wherein is disclosed anembodiment ofthe invention, but it is to be understood that changes, variations, and modifications may be resorted to without departing from the spirit of the claims hereto appended.

In the. drawings wherein like reference denote corresponding parts Figure 1 is a side elevation of the plug in. accordance with the present invention, 'showplug confined within the sleeve, I I Fig. 2 is a side elevation thereof illustrating the screw plug extended'from the sleeve,

9. A bridge wa1l'10v extends across the in- Fig. 3 is a axial section through-the sleeve iaken substantially -on the line 8-3 of 4 is an end elevation 'of the-bridge wa Fig 5 is an end elevation thereof, Fig. 6 is a perspective view of one of the is a perspective view of the operat Fig. 7

eferring to the drawings in detail, 8 is a tubular sleeve formed of hard rubber or other insulating, material, open at one end andclosed at the other end, by an inner wall terior of the sleeve adjacent the inner wall 9 balance of the plug.

plugs 23 the plug rusn nnncrmc PLUG 1930. Serial no. 433,889

walls thereof, and project from-thefree end of the sleeve 8 as will be clearly seen by referring to F ig. 1 of the drawings.

- Referring to the perspective view in Fig.

-6, where one of "the prongs are shown, the inner end of the prong is formed with a right no angled flange 13 having. an opening 14 extending through the flange. Both of the prongs extend throu h the slots in the bridge wall lOand the anges 13 thereof abut against the inner face of the bridge walland are secured. thereto by means of screws 15.

The screws 15 also attach the inner ends ofthe electrical conducting wires 16-'17.to, the prongs 11, 12 whereby electric current is supplied 'to the prongs. The bridge wall 10 is secured within the sleeve bymeans of screws 18 that couple the bridge wall in spaced relation to the inner wall 9. It will be understood that the screws 18 are free of contact with any of the electrical parts. A 7 central opening 19 is provided in the rear wall'9 to admit the insertion of the electric eonductin wires 16, 17 to the interior thereof.

.A soli cylindrical plug. 20 is slidable within the interior of the sleeve 8 and is 80. formed of any electrical insulating material.

is 'a air of s1ots 23,24 whic are enlarged .85 p on t eir inner ends to form shoulders 25 where these-enlarged ends merge with the The prongs 11, 12 extend through these 20. The bakelite disk 26-1s'secur'ed to the outer face of the plug-and is provided with a pair of openings 27 that register with theslots supported on the peripheral threads 22 of the plug 20, is a metallic bandthat extends around the plugs, and is formed with threads that-are supported on the threads 22.

Adjacent the outer ends of the slots, 24, the

- metallic band 28 is formedwith a tongue 29 that extends between the outer end of the 24' and provide sliding guides for 90 plugs 22 and disks 26 and projects into the slot ,24, the inner end of which is clinched as at against the shoulder 25. s

T e tongue 29 contacts with the prong 12, and forms one side of the electrical connection, when the plug is screwed into an electric socket. The other side of the electrical tact 31 that extendsinto the slot -23 contacts with the prongs-11.

From the foregoing it will be seen that the prongs 1l-12 not only provide sliding supports for the plugs 20, but alsoprovide electrical connections for the band 28 and the electrical contact 31, whereby electrical energy is provided to the socket to which the plug 20 is screwed.

When the plug 20 is confined within the sleeve 8, the prongs 11, 12 may be pushed into the slots in the wall socket, whereby a push plug is made out of the device by simple manipulation to be described.

. An elongated operating rod 34 is formed with anextension 35 on its outer end to rovide a gripping means for pushing or -pu ing the plug 20 on. the prongs 11, 12. The bar 34" extends through registering o enings 36, 37

. in the end wall 9 and the bri ge wall 10 respectively.. The inner ends'of the operating bar'34 extend into a pocket 38 in t e screw plug 20, and is anchored therein, by a set screw 39. V The outer end-ofthe' set screw is countersunk in the periphery of the plugilso as not to bind against the inner walls of t e sleevesB.

Having thus described my invention, what I claim as new is 1. An electric plug comprising a a pair of pron s extending from and within .the casing an pro'ecting' therefrom, a peripherally threade plug slidable on the prongs and in electrical contact therewith, and, means extending through the casing and engageable with the plug for moving the screw plug on the rongs. 1

- 2. An electric p ug including a casing,

closed at one end by'an inner walland formed of electrical insulating material, a bridge wall across the interior of the casing, adjacent the -inner wall thereof, a pair of prongs secured; at their inner ends to the bridge-wall extending through andproj'ecting from the open end of the casing, a peripherally threaded screw plug slidabl supported on the prongs, and in electrica contact therewith. j

3. 'An electric plug including a casing, closed at one end b an inner wall and formed of electrical insu ating material, a bridge wall across the interior of the casing, adjacent the inner wall thereof, a air of prongs secured at their inner ends to t e bridge wall extending through and projecting from the open end of the casing, a peripherally threaded screw. plug slidably supported on the pron and'in electrica contact therewith, an means extendinglthroiigh the easing and en ageable with t e screw plugs to move the p ug on the prongs. In testimony whereof I afiix my si ature.

. 7 JOHN A; GEFF RT.

- The .0 rating bar 34 as shown extends throng the endwall 9 andprojects therefrom, so. that the screw plugs 20 may be moved inwardly'or outwardly of the sleeves.

In the event it is desired to operate the I plugs 20 from the side of the sleeves 8, there is provided a longitudinally extending slot40 through which aplug not shown in the drawings, may extend. from the'pl'ugs 20' through the slot and may be eng'agedfrom the out side thereof by the finger of the operator.

It will be seen from the drawings, when the, *plug 20 is 'in' the extended position, the outer I endsof the prongs 11, 12 are seated beneath the insulating disk 26 so that there will not be. any possibility plugs. I

of short-circuiting the It is to be understood that by describ g a.

' detail herein any particular form, structure,

or arrangement,.it is not intended to limit the invention beyond the" terms of the several claims, or the requirements of the prior art. 

